Wedge issues are controversial matters:
a. that one party uses to split voters in the other party
b. that undecided voters use to choose their preferred candidate
c. that are generally ignored in campaigns because they are too explosive
d. on which most voters and candidates share the same position
e. that differentiate the two major candidates

Option A

Explanation:

Wedge issues are related to political issues that causes division in a particular group or party  based on the fact that they have diverging point view.

The best option among the options listed that best explains a wedge issue is Option A " A wedge issue is a controversial matter that one party uses to split voters in the other party", due to their difference in understanding of a particular issue.

answer; (d) all of the above; 100%